Dissolution of brass alloys naturally aged in neutral solutions – an electrochemical and surface analytical study

Cocco, F.; Fantauzzi, Marzia; Elsener, Bernhard; Rossi, Antonella

doi:10.1039/c6ra18200c

Cited by 5 publications

(28 citation statements)

References 20 publications

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“…The electrochemical behavior of brass in contact with the test solutions was investigated by EIS at the open circuit potential (OCP), the values can be seen in Tables 1, 2. The change of the OCP with time was in agreement with a previous paper (Cocco et al, 2016a). The impedance spectra of all brass alloys after 1 and 16 h immersion in the phosphate buffer solution are shown in Figure 2.…”

Section: Electrochemical Impedance Spectroscopy (Eis)supporting

confidence: 90%

“…In a previous work (Cocco et al, 2016a), based on open circuit potential, DC polarization resistance measurements, and preliminary XPS/XAES surface analysis data, it was hypothesized that the dissolution of the brass alloys exposed to phosphate buffer solution and to artificial saliva solution was controlled by the different surface films formed. Using electrochemical impedance spectroscopy (EIS) and a full set of XPS/XAES surface analysis data, a more detailed insight into the reaction mechanism of the brass alloys with zinc content ranging from 18 to 38% exposed to the two different solutions can be provided and the rate controlling step can be established.…”

Section: Discussionmentioning

confidence: 99%

“…The P 2p showed a well-separated spin-orbit doublet; the energy separation between 2p 3/2 and 2p 1/2 is 1.2 eV. The P 2p 3/2 signal was found at 133.8 eV and it was likely assigned to the presence of phosphate group according to Cocco et al (2016a).…”

Section: Cuzn37mentioning

confidence: 94%

“…% Zn. The composition of the alloys, determined by XRF, is reported in Cocco et al (2016a). The alloys CuZn18, CuZn28, CuZn35Pb1, and CuZn38Pb2 were produced according a procedure that allows obtaining compositions and metallurgical structures as close as possible to alloys used in the nineteenth century (Von Steiger et al, 2013).…”

Section: Materials and Surface Preparationmentioning

confidence: 99%

“…In our previous work (Cocco et al, 2016a) the electrochemical behavior of a series of brasses (Zn content from 18 to 38 wt. %) was investigated after contact with two neutral solutions: artificial saliva solution and diluted pH = 7 phosphate buffer solution at the open circuit potential (OCP).…”

Section: Introductionmentioning

confidence: 99%

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Model Protective Films on Cu-Zn Alloys Simulating the Inner Surfaces of Historical Brass Wind Instruments by EIS and XPS

et al. 2020

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The present work focuses on the characterization of brass surfaces after contact with artificial saliva solution at pH 7.4 and phosphate buffer solution at pH 7 simulating two extreme conditions that might occur when playing ancient brass wind instruments in the context of historically informed performance practice. The composition and the morphology of the film formed following the contact with the solutions for 1, 3, and 16 h were investigated by ex situ X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) to shed a light on the surface changes upon time. In situ electrochemical impedance spectroscopy (EIS) was used to study the mechanism of corrosion and protection of the alloys. The results could be interpreted using a reliable equivalent electrical circuit; they provided evidence that the alloys behave differently when in contact to the various solutions. In saliva solution the formation on the brass surface of a thick surface film was observed, composed of crystallites of about 200 nm size mainly composed of CuSCN and Zn 3 (PO 4) 2. This layer hinders the alloy dissolution. The contact of the alloys with the buffer solution originated a much thinner layer composed of Cu 2 O, ZnO, and a small amount of Zn 3 (PO 4) 2. This film is rapidly formed and does not evolve upon time in a protective film.

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Section: Electrochemical Impedance Spectroscopy (Eis)supporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Cuzn37mentioning

confidence: 94%

Section: Materials and Surface Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Model Protective Films on Cu-Zn Alloys Simulating the Inner Surfaces of Historical Brass Wind Instruments by EIS and XPS

et al. 2020

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X ‐Ray Photoelectron Spectroscopy ( XPS )

Fantauzzi

Rossi

2018

The Encyclopedia of Archaeological Sciences

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X‐ray photoelectron spectroscopy (XPS) is a surface‐sensitive laboratory technique exploited to obtain elemental analysis, chemical state information, and quantitative composition of materials of historical interest in a nondestructive way. The sample has to be stable in ultra‐high vacuum, and limitation on the size requires sometimes an appropriate sampling strategy before XPS analysis. The basics of the technique and some examples of its application to pottery, glass, metals, alloys, and cellulose materials are provided in this brief review, aiming to highlight the possible applications of XPS in the analysis of historical materials, in ascertaining the origin of the degradation of artifacts in order to tailor proper conservation actions.

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The effect of the saliva formulation on brass corrosion

Biggio

Elsener

Atzei

et al. 2022

Materials & Corrosion

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The composition of natural saliva is strongly variable and unstable outside the oral cavity, therefore corrosion tests are usually performed in artificial saliva solutions. In this study the effect of the composition of various saliva solutions on the corrosion behavior of a CuZn37 alloy, exposed for 1, 3, and 16 h to the solutions, is investigated by using electrochemical measurements, optical microscopy, and X-ray photoelectron spectroscopy (XPS). The solutions investigated in this study are: Darvell, Carter-Brugirard, and SALMO, selected for their composition that mainly differs in the organic compounds' content. Electrochemical measurements show that the open circuit potential and the polarization resistance increase with exposure time in the solutions, indicating a decrease in the corrosion rate. The corrosion rate (µm/year) in the Darvell solution is found to be two times higher than the other artificial saliva formulations and varies in the order: Darvell > Carter-Brugirard > SALMO. These data suggest that the presence of different organic compounds might limit the formation of a stable protective surface film as confirmed by XPS surface analyses.

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Dissolution of brass alloys naturally aged in neutral solutions – an electrochemical and surface analytical study

Abstract: Combining electrochemical and surface analytical information promotes the understanding of the dissolution mechanism of complex systems such as brass alloys.

Cited by 5 publications

References 20 publications

Model Protective Films on Cu-Zn Alloys Simulating the Inner Surfaces of Historical Brass Wind Instruments by EIS and XPS

Model Protective Films on Cu-Zn Alloys Simulating the Inner Surfaces of Historical Brass Wind Instruments by EIS and XPS

X ‐Ray Photoelectron Spectroscopy ( XPS )

The effect of the saliva formulation on brass corrosion

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